How to saw a metal pipe from the inside. Who is authorised to do the work?

What to saw a metal pipe from the inside

When using thin cutting blades, remember that they generate less heat during operation, create less vibration in the tool, cut in less time, and waste less metal per cut.

  • Clamp the workpiece securely to the intended cutting point and make sure that the workpiece does not move.
  • Using a template, check for proper tool installation and disk attachment by running the sander at idle. This is necessary to eliminate possible lobe balancing problems.
  • At the beginning of the workpiece separation, the blade is always fed at a 90° angle to the workpiece, making sure that the blade guard is positioned between the worker and the workpiece. During cutting, it is necessary to avoid hitting the metal with the disc, so the process begins in the area where the metal is thinnest.

Important! Do not apply too much pressure when working with thin-walled parts, the disc will do its job just fine.

Causes of gas pipe cutting

The most common motive is to carry out repairs, during which it is decided to change the position of the plate or install new equipment. All of this can encourage owners to shorten a gas pipe.

Also, the initiator can be a representative of the gas company that legally requires the meter to be moved out of sight.

In old houses you can observe the following: the branch from the gas pipe interferes with the convenient arrangement of curtains or kitchen set modules. This, too, is often the cause of trimming

It may also require shortening due to the non-compliance of outdated communications with modern regulations. Regulations are regularly updated, and homeowners very rarely keep track of the changes on their own.

Right angle pipe trimming

Trimming at right angles is pretty straightforward. You just need to fix the metal part, mark the line of the cut, and directly cut the workpiece. The end of the cut off part of the pipe must be above the support.

To draw a mark for the cut is suitable wide or narrow tape, marker or a simple pencil. It will be necessary to simply wrap the product, mark the place of the cut, and make an even cut. When winding, both ends of the tape must be docked precisely with each other

The equipment of industrial use

In professional construction and when working with large engineering objects, the question of how to evenly cut a pipe with a large diameter is solved by using special equipment. Quite often. these are stationary units with a certain set of qualities.

Among the most interesting and functional devices are the following:

  • Lathe of various modifications. With this machine it is possible to cut profiled pipe evenly both for ordinary plumbing and especially durable products through which liquids with an aggressive environment will pass.

The maximum cross-section of the processed pipe will vary depending on the distance between the supporting heads and the diameter of the holes in the spindle. These units can be called universal, because they can cut, bevel, and perform a number of other operations, often in automatic mode.


  • Band cutting machines. Such units are used to cut water or sewer pipes previously laid in trenches or conducted in a building.

The belt cutting machine can process pipes, even those that have been subjected to quite severe deformation. Additionally, such a torch can be chamfered to the required shape.

  • Machines for cutting with disc knives. This type of equipment is capable of cutting pipes of any metal, including non-ferrous. In addition, they have no restrictions on the shape of the product. they can be either round or profiled, with a fairly large cross-section.

Typically, these units are installed on conveyor belts and additionally equipped with a machine that, after cutting, collects and packages a specified number of pieces of pipe, which will then be sent to customers.

metal, pipe, work

P-Trap Installation Drain Doesn’t Line Up Bathroom Sink Pipe

  • Torches with hand-held discs. They are used mainly in cases where cutting a large number of pipes is required directly in the places where they are laid. Such machines have a special clamp that tightly encloses the pipe during cutting, preventing it from shifting and deforming. Due to this quality such equipment can be successfully applied to both metal-plastic and copper or steel pipes.

A number of disc-type cutting machines have a built-in orbital welding and rotating system that allows a single mechanism to cut and then join parts. Such a device can be very useful if you need to perform a very large amount of work on cutting, welding or joining pipes without having stationary equipment.

Nevertheless, such a multifunctional device is not necessary if you have a small amount of work that does not require complex mathematical calculations and compliance with standards.

Often, evenly cut the pipes you can use simple hand tools, which can be found in every owner.

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Thermal cutting applications

In addition to mechanical cutting methods, it is often the case that thermal cutting methods are used, such as welding and cutting equipment. For example, an autogenous gas torch or a conventional welding machine (DC/AC).

Thick-walled metal pipes can be cut with these machines. However, it is extremely difficult to obtain a perfectly even quality cut with electric welding or a gas autogenous oxyfuel.

The technology of cutting with electric welding and autogenous arc welding is widespread. The technique does not provide a high precision cut, but this is often not a decisive factor in pipe installations

Cutting technology using electric welding and autogenous gas cutting is widespread. The technique does not provide a high accuracy of cut, but in the installation of pipes this factor is often not decisive

Usually after thermal cutting, the products are subjected to additional processing. The line for the cut trimmer is aligned, and the values of the required angle are adjusted. Such an approach is not economically profitable, because it comes with the additional cost of machining.

As a rule, the thermal cutting technique is used in the industrial sector. It is true that utilities often use this technique, too.

Thermal cutting is also used for plastic material. There are devices. thermal guillotines. The sharp, thin blade of these machines is heated to a high temperature, and then the cut is performed.

Thermal guillotines support angled cutting, and that’s an advantage. However, for working with tougher materials than PVC, wood, chipboard, these devices cannot be used.

For cutting metal-plastic pipes, you need pipe cutters that can evenly divide products with a multi-layer structure into pieces. Their varieties and applications are covered in our recommended article.

Cutting metal with an angle grinder

angle grinder. It is an angle grinder, on which different grinding, abrasive, cutting circles are installed. A special cutting disc is used to cut metal. After cutting, the place of the cut is machined with a sanding disc.

angle grinder today is probably the most productive tool for non-professional metal cutting. It makes it fairly easy to cut both pipes, rods, angles, and (with some training) sheets of metal. See also more about the types of blades for angle grinders.

Ways to cut steel pipes

– Laser cutting

  • Total safety because everything is automated;
  • Even an unqualified person can do it;
  • Perfectly straight cuts of any size are made;
  • Zero waste and fast production.

– Hand cutting

Carried out with the help of cutters on a pre-drawn marking. Such a process is quite time-consuming and requires a skilled worker. If there is insufficient experience, uneven surfaces, corners and shapes can result. Accordingly, no further joining of the tubular workpieces is possible.

– Cutting with circular saws

Only used when product volumes are small, but quality must be high. The circular saw is cut by turning 360 degrees. The angle can be absolutely any. Circular saws are of two types: manual and automatic. The latter are much more accurate.

– On a circular saw

Only perpendicular cuts are made. Product surface remains flat. The machine makes cuts up to 45 degrees.

How to cut a profile pipe longitudinally. cutting technology

If the cross cutting of the profile does not cause much difficulty, the longitudinal cut, which is necessary for some work in the home, is more difficult because of its length.

One of the problems when it is carried out. the accuracy of marking, for its drawing in the center or at another point of the cut face put a mark along the entire length at the same distance from the side wall and then connect them with a pencil, marker or scribe, using as a guide flat corner, a construction rule, level, profile of drywall.

In order to saw the metal profile in the longitudinal direction, lead the angle grinder along the line, gradually cutting a through hole. the method is not too accurate, the tool has to be held in the weight without support.

metal, pipe, work

A more convenient way to qualitatively cut the workpiece longitudinally is to use auxiliary supports in the form of a metal angle or flat straight plates. To do this, the corner is attached to the surface of the workpiece with clamps and lead the angle grinder along its side edge, if the length of the template corner is short, it is unscrewed and moved further to a new place, after which the cutting is resumed.

The second method of obtaining an even longitudinal line of cut is a rigidly mounted angle grinder on a machine or table in a sideways position. Cut workpiece in this case move along the guides, bringing to the rotating disk of the angle grinder (the principle of operation resembles an electric tile cutter), the straightness of the resulting line is determined by the rigidity and length of supporting elements.

To obtain the specified sizes and configurations of profile pipes in the household, cutting is used with an angle grinder and inexpensive corundum cutting discs. To get an even and accurate line for the cut trimmer, it is better to use supporting guides or homemade steel templates that set the desired angle.

When working with construction or plumbing tasks, you need to know how to evenly cut a pipe with an angle grinder. In this article, let’s look at quick and easy ways to cut the pipe with an angle grinder, so that the result is perfect.

In industrial scale they lay gas pipelines with diameters up to 1600 mm, and you can not do without scissors or an angle grinder with a cutting wheel. Therefore, the cutting of polypropylene pipes of large diameter is performed by a special pipe cutter. For example, for single cuts, chain-driven shears are most often used, as in the top photo, but for laying industrial pipelines, it is certainly better to use cutting tools with an electric drive.